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Influence of Large LOCA by Seismic Event

DEMJANČUKOVÁ, K. Influence of Large LOCA by Seismic Event. Praha, 2011.
Jazyk publikace: eng
Anglický název: Influence of Large LOCA by Seismic Event
Rok vydání: 2011
Autoři: Ing. Kateřina Demjančuková
Abstrakt EN: The limiting condition for the emergency core cooling system requirements is provided by the double-ended-guillotine break criterion of the largest primary piping system in the nuclear power plant (NPP). United Stated Nuclear Regulatory Commision (US NRC) reached the conclusion that the rupture of primary circuit pipeline with a 850 mm diameter is improbable. Expert elicitation method determined the transition break size (TBS) for pressurized-water reactors (PWR) within the range of 305 ? 356 mm (for the pipelines connected to the main circulation loop) and for boiling water reactors (BWR) of 500 mm, controlled primarily by the surge line and is expected to have a frequency less then 10-5 per year. The purpose of this paper is to present the main idea and basic assumptions for the assessment of the range of transition break size influenced by a seismic event.
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